It took a second to realise what I was looking at but as soon as I ralised that it was my brothers girlfriend Suzy, bouncing up and down on my brother... willy, my jaw dropped and I looked around to Mary, who was in her room gesturing for me to come in.I slowly tip toed into her room and gently closed the door behind me. Before I could say anything Mary asked what is she doing to your brother. I said that i didn't know for sure, but I think she's having sex with him, to which Mary said what's. .. yeah ... well ... if you’re sure I’m won’t be a fifth wheel,” I managed.“No, not at all. We usually come here after work on Friday to unwind. Come on over. We won’t bite,” she giggled, now having decided I was comfortable with her approaching me.I picked up my mug of beer and followed her over to her table of six. Karla was right, I did recognize a couple of the four other girls.“Girls, you remember Nick Minter don’t you? He was going with Marianna Alvarez when we were in college together,”. A hand blurred across my vision. Her gesture broke a gaze that had been lost in the mysterious shadow between her legs, and she knew it. I was embarrassed and made a lame apology. She smiled and asked me if I would like to dance again before taking her home. A slow song was playing. I knew before we stood up that there was no way she could miss the lump in my pants if we danced the way we had earlier. A thought brushed the edge of my alcohol induced groove that this might be a problem, but it. Two minutes later, she smiled and begged me to hurry up and cum for her…Her urgency made me even more aroused and I then started to cum all over the lavatory. Alicia stood there and watched me cum and it was such a turn on. As I began to clean up she surprised me again and reached out his hand to grab my still hard cock. Her fingers took some cum drops and my nasty sister in law licked them as she smiled at me. She then just turned and walked away…A few minutes later I joined the group outside.